Troubleshooting
Wagner's Sage problems — and how to fix them
Wagner's Sage (Salvia wagneriana) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Whitefly
Whitefly adults and nymphs cluster on the undersides of leaves, causing yellowing and weakening of vigorous new growth; treat with insecticidal soap or a yellow sticky trap and repeat applications every 7 days.
Frost damage
Even a light frost will blacken and collapse the stems; in USDA zones 8 and below, move containerised plants under cover before the first autumn frost or take semi-ripe cuttings in late summer as insurance.
Prevent wagner's sage problems before they start
Most wagner's sage issues are care-mismatch, not bad luck. Dial in the basics:
Wagner's Sage problems — FAQ
Why is my wagner's sage whitefly?
Whitefly adults and nymphs cluster on the undersides of leaves, causing yellowing and weakening of vigorous new growth; treat with insecticidal soap or a yellow sticky trap and repeat applications every 7 days.
Why is my wagner's sage frost damage?
Even a light frost will blacken and collapse the stems; in USDA zones 8 and below, move containerised plants under cover before the first autumn frost or take semi-ripe cuttings in late summer as insurance.